Process of treating wood



Patented June 24, 1930 'UNlTED STATES PATENTFFIGE FERNANDO SOMOZA VIVAS, or new YORK, 1v. Y., assronoa To INTERNATIONAL FIRE- raoor PRODUCTS CORPORATION, or NEW YORK, N. Y., A CORPORATION 01* DELA- WARE PROCESS or TREATING woo];

No Drawing. Application filed october 8, 1927. Serial No. 225,037.

The invention relates to a process of treatthe same insect-proof and fire-proof which ing wood and has as an object rendering of comprises introducing a solution of sodium the wood free from attacks of insects. carbonate into the pores of the wood, drying It is a further object of the invention to the Wood to remove a substantial portion of provide a wood which will not be attacked the water of the solution, introducing asolu- 55 by insects and which is fireproof or exceed- .tion of copper sulphate into the pores of the ingly fire-resistant. wood, drying the completed product.

It is a further object of the invention to 3. The process of treating wood to make impregnate wood with an artificial malachite the same insect-proof and fire-proof which for the purposes already named. comprises saturating the wood with a solu- 60 An illustrative embodiment of the process tion of sodium carbonate comprising subfor carrying out the objects of the invention stantially two and one-half pounds of caris as follows: bonate to the gallon of water, drying the wood The wood is first subjected to a vacuum in vacuum until substantially sixty per cent and is then without breaking the vacuum subof the water is removed, placing the wood in 5 merged in a solution of sodium carbonate of a solution of copper sulphate in substantiala desirable strength of two and one-half ly the proportion of one-half pound of sulpounds to the gallon of water. After thorphate to a gallon of water and forcing the soough saturation of the timber, the timber is lution into the pores of the wood under presdried in a vacuum to remove substantially sure, withdrawing the solution and drying 7o sixty per cent of the water of the solution. the wood. g

The timber is next treated under pressure FERNANDO SOMOZA VIVAS.

by forcing into its pores a solution of copper sulphate of a desirable strength of one-half I pound of sulphate to a gallon of water there- 75 by depositing in the pores of the wood malachite of the formula Cu (OH) CO This material is poisonous to all insect life such as teredo, white ants, etc. The timber is then dried and is ready for use. so

In addition to its insect proof qualities, the thus treated timber is waterproof and exceedingly fire-resistant, and is very desirable for use as piling, and in the construction of buildings subjected to the attacks of 35 white ants or other insects, and will not be attacked by fungus growths.

Minor changes may be made in the steps of the process and in the proportions of the sub- 4i) stances named within the scope of the apo pended claims without departing from the I spirit of the invention.

I claim: 1. The process of treating wood to make a the same insect-proof and fire-proof which comprises introducing sodium carbonate into 1the pores of the wood and subsequently introducing coppersulphate into said pores 1 whereby to precipitate malachite therein. 1

2. The process of treating wood to make '1'00 

